21816746218 has 8 divisors (see below), whose sum is σ = 32725952640. Its totient is φ = 10908095340.

The previous prime is 21816746179. The next prime is 21816746243. The reversal of 21816746218 is 81264761812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20538 + ... + 209893.

It is an arithmetic number, because the mean of its divisors is an integer number (4090744080).

Almost surely, 2^21816746218 is an apocalyptic number.

21816746218 is a deficient number, since it is larger than the sum of its proper divisors (10909206422).

21816746218 is a wasteful number, since it uses less digits than its factorization.

21816746218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277772.

The product of its digits is 258048, while the sum is 46.

The spelling of 21816746218 in words is "twenty-one billion, eight hundred sixteen million, seven hundred forty-six thousand, two hundred eighteen".